-
- دوشنبه تا شنبه: 10:00 - 16:00 / یکشنبه تعطیل است
The heat from the ammonium carbonate formation exothermicity increased the temperature in the gypsum conversion reactor contents by 35 K, significantly reducing the heating requirements to achieve ...
به خواندن ادامه دهید
A facile method to transform flue gas desulfurization gypsum to α- calcium sulfate hemihydrate (α-HH) whiskers with high aspect ratios mediated by cetyltrimethylammonium bromide and KCl in glycerol-water solutions was studied. A facile method to transform flue gas desulfurization gypsum (FGD gypsum) to α- calcium …
به خواندن ادامه دهید
The largest sulphur reservoirs on the Earth are iron sulphides (pyrite; FeS 2) and gypsum (CaSO 4) in sediments and rocks (7,800 x 10 18 g sulphur) and sulphate in seawater (1,280 × 10 18 g ...
به خواندن ادامه دهید
About GitLab GitLab: the DevOps platform Explore GitLab Install GitLab Pricing Talk to an expert /
به خواندن ادامه دهید
Waste gypsum, industrial waste including flue gas desulfurization (FGD) gypsum (25.27–53.40 wt% of CaO), and phosphogypsum (30.50–39.06 wt% of CaO) can be used for direct MC (conversion rate ...
به خواندن ادامه دهید
Stoichiometrically, for every 1.0 tonne of ammonium sulphate produced, 0.9 tonnes of PCC is also produced and 1.6 tonnes of gypsum and 0.4 tonnes CO 2 are consumed. South Africa has an …
به خواندن ادامه دهید
The reactivity of flue gas desulphurization gypsum with ammonium carbonate has been studied in the temperature range (20–50) °C. Mechanism of this reaction was suggested and the kinetics parameters characterizing the reaction were determined. A mathematical model suitable for the prediction of the conversion of …
به خواندن ادامه دهید
Waste gypsum, industrial waste including flue gas desulfurization (FGD) gypsum (25.27–53.40 wt% of CaO), and phosphogypsum (30.50–39.06 wt% of CaO) can be used for direct MC (conversion rate ...
به خواندن ادامه دهید
Here, we transformed gypsum, CaSO4·2H2O, into vaterite, CaCO3, by sonication. We studied conversion, phase compositions and morphologies of carbonation products, and sulfate (SO42− ...
به خواندن ادامه دهید
Phase 1 of the project focused on the process for converting FGD-gypsum to ammonium sulfate fertilizer with PCC produced as a by-product during the conversion. …
به خواندن ادامه دهید
Contribute to chengxinjia/sbm development by creating an account on GitHub.
به خواندن ادامه دهید
sulfuric acid to produce magnesium sulfate heptahydrate and calcium sulfate dihydrate (gypsum). Magnesium sulfate heptahydrate containing 16.23% MgO was obtained at the following optimum conditions The particle size was -150μm, temperature of the reaction was 60 o C, time of reaction 50.0
به خواندن ادامه دهید
Chemical reactions involved in the process of conversion of SO 2 gas into FGD gypsum is as follows [8], ... FGD gypsum is typically more than 90% pure calcium sulfate dihydrate, with minimal impurities. This high purity makes FGD gypsum ideal for use in a variety of manufacturing processes, such as the production of cement and …
به خواندن ادامه دهید
ammonium sulfate is manufactured from gypsum by a continuous process in which an aqueous flow of material is continously recycled along a predetermined closed circuit defined by a conduit and a wider vallel connected in series. a fresh aqueous gypsum slurry comprising a dispersion of finely divided gypsum in an ammonium sulfate solution is …
به خواندن ادامه دهید
The average market price of granular ammonium sulfate ($138/ton) exceeds the rough estimated cost of ammonium sulfate from the proposed process ($111/ton), by 25 percent, if granular size ammonium sulfate crystals of 1.2 to 3.3 millimeters in diameters can be produced by the proposed process.
به خواندن ادامه دهید
The scrubber, a Chiyoda Thoroughbred 121 FGD, produced a filter cake product contains 98.36% gypsum (CaSO{sub 4}.2H{sub 2}O), and less than 0.01% calcium sulfate (CaSO{sub 3}). Conversion of FGD-gypsum to ammonium sulfate were tested at temperatures between 60 to 70{degrees}C for a duration of five to six hours.
به خواندن ادامه دهید
A continuous countercurrent flow process for converting FGD gypsum to ammonium sulfate and calcium carbonate including countercurrent flows with internal recycle of liquids to maximize the purity of reaction products while minimizing reaction times, and further include embodiments of the process that provide a yield of both ammonium …
به خواندن ادامه دهید
Mineral carbonation converts waste gypsum into calcium carbonate (CaCO3), which can be recycled during desulfurization. Furthermore, ammonium sulfate ( (NH4)2SO4), which is used as a fertilizer ...
به خواندن ادامه دهید
production increased by adding FGD by-products. FGD gypsum reacts with ammonium carbonate in an aqueous solution to produce ammonium sulphate fertilizer, which is a …
به خواندن ادامه دهید
The plant consumes coal at a rate of 0.96 pounds per kwh and the sulfur content of the coal is about 3%. Based on a load factor of 65% for 300 days per year of operation, the plant produces 200,000 tons gypsum per year. Ammonia gas - Assuming 98% recovery, one ton of gypsum could produce 0.752 tons of ammonium sulfate.
به خواندن ادامه دهید
Natural gypsum fulfills the demands of the cement industries and is used by farmers as a direct fertilizer for reconditioning of alkaline solids for reducing alkalinity and …
به خواندن ادامه دهید
High yields (up to 83%) of ammonium sulfate with up to 99% purity were achieved under relatively mild conditions. The optimal conversion condition was observed at 60°C and a 4-hour residence time ...
به خواندن ادامه دهید
Flue-gas desulphurization (FGD) gypsum is a highly prevalent industrial by-product worldwide, which can be an excellent alternative to natural gypsum due to its high content of CaSO4·2H2O. The preparation of α-calcium sulfate hemihydrate is a high-value pathway for the efficient use of FGD gypsum. Here, a dynamic method, or an improved …
به خواندن ادامه دهید
In this study, the FGD-gypsum will be tested for conversion to calcium carbonate and ammonium sulfate by reacting it with C02 and ammonia or by reacting it with …
به خواندن ادامه دهید
The reaction of calcium dihydrogen phosphate solution with sulfuric acid in the presence or absence of HF, H 2 SiF 6, and Al 3+ ions was used to simulate the crystal growth process of α-type hemihydrate calcium sulfate (α-HH) with 30% P 2 O 5 at a reaction temperature of 95 °C. The changes in Ca 2+ ion concentration in the solution were …
به خواندن ادامه دهید
Disclosed herein are systems and methods from processing flue gas desulfurization (FGD) gypsum feedstock and ash feedstocks, either separately or together. FGD gypsum conversion comprises reacting FGD gypsum (calcium sulfate) feedstock or phosphogypsum, in either batch or continuous mode, with ammonium carbonate …
به خواندن ادامه دهید
You can not select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
به خواندن ادامه دهید
4,953 lbs SO 2 /hr * (100.1à·64) à·0.97 = 7,986 lbs/hr of limestone consumption. To this number must be added the unused limestone that appears in the byproduct. We have seen that full load ...
به خواندن ادامه دهید
In this paper, waste gypsum from wet flue gas desulfurization (WFGD) mixed with NH3·H2O was applied for CO2 absorption in the solid-liquid-gas phase system. The effects of operation temperature, CO2 flow rates, and ammonia-to-gypsum ratio on carbonation process were discussed. Meanwhile, a model for CO2 absorption in the …
به خواندن ادامه دهید
Reference may also be made to the article "Disposal or use of gypsum in production of ammonium sulfate" by N. D. Gopinath in Phosphoric Acid, Vol. 1, Part II, (ed. A. V. Slack), Marcel Dekker, New York, 541-566 (1968) which discusses the conversion of gypsum into ammonium sulfate by its reaction with ammonium carbonate.
به خواندن ادامه دهید